<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./react/react.development.js"></script>
    <script src="./react/react-dom.development.js"></script>
    <script src="./react/babel.min.js"></script>
    <script src="./react/prop-types.js"></script>
    <script src="./react/lodash.min.js"></script>
    <script src="./react/immutable.min.js"></script>

</head>
<body>
<div id="app"></div>
<script type="text/babel">

    let app = document.querySelector('#app');

    let root = ReactDOM.createRoot(app);

    class Welcome extends React.Component {
        myRef = React.createRef()
        handleSubmit = (ev) => {
            console.log(
                this.myRef.current.files[0].name
            );
            ev.preventDefault();
        }
        render(){
            return (
                <form onSubmit={this.handleSubmit}>
                    <input type="file" ref={this.myRef} />
                    <input type="submit" value="submit" />
                </form>
            );
        }
    }
    let element = (
        <Welcome />
    );

    root.render(element);

</script>
</body>
</html>